workaround the whitespace issue in ParseKit (https://github.com/itod/parsekit/issues/29)
First parsing work on CoreParse
cleanup and remove ParseKit, everything is broken at this point
Implement ID and Attributes
Implement CSS Selector Sequence.
add CSSSelectors
add group
add basic support to parse pseudo class
Instead of Pods, install CoreParse as submodule and include the library, as advised by the author
Enable selector sequence toXPath, fixes many specs
remove reverse iteration in various classes, which is added for ParseKit and no longer needed for current parser
fixes toXPath of group and sequence
fixes attribute toXPath
fix rendering combinator
Add error recovery
add tests
organize grammar
Use new regex recognizer to match
fixes rendering of pseudo class selector
refactor